Vertex Corrections and the Korringa Ratio in Strongly Correlated Electron Materials

Abstract

We show that the Korringa ratio, associated with nuclear magnetic resonance in metals, is unity if vertex corrections for the dynamic spin susceptibility are negligible and the hyperfine coupling is momentum independent. In the absence of vertex corrections we also find a Korringa behaviour for $T_1$, the nuclear spin relaxation rate, i.e., $1/T_1\propto T$, and a temperature independent Knight shift. These results are independent of the form and magnitude of the self-energy (so far as is consistent with neglecting vertex corrections) and of the dimensionality of the system.

5 pages. accepted for publication in J. Phys.: Condens. Matter

References in corpus (4)

• Strong electronic correlations in superconducting organic charge transfer salts
• Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates
• Antiferromagnetic Spin Fluctuations in the Metallic Phase of Quasi-Two-Dimensional Organic Superconductors
• Dynamic spin-response function of the high-temperature Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ superconductor form angle resolved photoemission spectra

Cited by in corpus (2)

• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• Nuclear Magnetic Resonance in Low-Symmetry Superconductors